/**
 * Copyright (c) 2008, Mu Dynamics.
 *  All rights reserved.
 *  
 *   Redistribution and use in source and binary forms, with or without modification, 
 *   are permitted provided that the following conditions are met:
 *   
 *  - Redistributions of source code must retain the above copyright notice, 
 *     this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright notice, 
 *     this list of conditions and the following disclaimer in the documentation and/or 
 *     other materials provided with the distribution.
 *  - Neither the name of the "Mu Dynamics" nor the names of its contributors may be used 
 *     to endorse  or promote products derived from this software without specific prior 
 *     written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.mu.jacob.core.ant;

import java.util.Properties;

import org.apache.log4j.PropertyConfigurator;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.taskdefs.Property;
import org.apache.tools.ant.types.Path;
import org.apache.tools.ant.types.PropertySet;
import org.apache.tools.ant.types.Reference;

/**
 * Abstract generator task, manages properties and path.
 * @author Adam Smyczek
 */
public abstract class GeneratorTask extends Task {

	private final PathHelper pathHelper;
	private final PropertyHelper propertyHelper;
	
	/**
	 * Default constructor initializes helpers 
	 * and log4j logger
	 */
	public GeneratorTask() {
		super();
		this.pathHelper = new PathHelper();
		this.propertyHelper = new PropertyHelper();
		
		PropertyConfigurator.configure("./log4j.properties");
	}

	/**
	 * Delegate project to path helper
	 */
	@Override
	public void setProject(Project project) {
		super.setProject(project);
		pathHelper.setProject(project);
		propertyHelper.setProject(project);
	}
	
	/**
	 * @return properties
	 */
	public Properties getProperties() {
		return propertyHelper.getProperties();
	}

	/**
	 * Add property set
	 * @param propertySet
	 */
	public void addConfiguredPropertySet(PropertySet propertySet) {
		propertyHelper.addConfiguredPropertySet(propertySet);
	}
	
	/**
	 * Add a property 
	 * @param property
	 */
	public void addConfiguredProperty(Property property) {
		propertyHelper.addConfiguredProperty(property);
	}
	
	/**
     * Set class path
     * @param classpath
     */
    public void setPath(Path path) {
    	pathHelper.setPath(path);
    }

    /**
     * @return returns path
     */
    public Path getPath() {
    	return pathHelper.getPath();
    }
    
    /**
     * Add path to class path
     * @return class path
     */
    public Path createPath() {
    	return pathHelper.createPath();
    }

    /**
     * Set reference to class path
     * @param reference
     */
    public void setPathRef(Reference reference) {
    	pathHelper.setPathRef(reference);
    }
    
    /**
     * set current loader to the context
     *
     */
    protected void setThreadContextLoader() {
    	pathHelper.setThreadContextLoader();
    }
    
    /**
     * reset current context loader
     */
    protected void resetThreadContextLoader() {
    	pathHelper.resetThreadContextLoader();
    }
    
	/**
	 * Create instance for a className using baseClass
	 * @param <T>
	 * @param className
	 * @param baseClass
	 * @return instance of class for name className
	 * @throws BuildException if class for className can not be found
	 */
	protected static <T> T newInstance(String className, Class<T> baseClass) throws BuildException {
		try {
			final Class<?> cls = Class.forName(className, false, Thread.currentThread().getContextClassLoader());
			if(baseClass.isAssignableFrom(cls)) {
				return cls.asSubclass(baseClass).newInstance();
			} else {
				throw new BuildException("Class " + className + " is not a " + baseClass.getName());
			}
		} catch (Exception e) {
			throw new BuildException("Unable to instantiate builder " + className, e);
		}
	}
	
}
